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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e72b756fa6704a5146eed7c29aa30878b90a9d6868e77d107234c154953c5a32' 
  AND token = 'kL5EyS1hZgw1uPLltin1563d+RbEXQcikMpRHH1K0Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00298

JSON explain

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