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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c717b311a1fac6554c8d930df08370ce5922efffeb3939c12e9ec49af3831aa' 
  AND token = 'QOdi5f8GZfiuf0fhyfyFk23RCRX8k1Erhh5sd+Dee0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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