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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a20aeddbd5adef1e489eca1c63d8092d7480102b7fe96c1fbf2d6e689996fb2' 
  AND token = 'u4qJdcHz4ZA+kR83/UQYKLDJ2KR2/qoZMJUWD74Sixg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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