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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bc33fb1ccf0ddd7f119690d0513835abb2faa488a1b1759182d3e9ec029ec83' 
  AND token = 't07wQjuuRUJ/glHMrHHMCXRlwJrJXnPEY4pdUTcd7tI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}