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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870f749cdacf36d1034ff388ce9b567d51cb32a66b3c2832fca4ee0c722cc249' 
  AND token = '3Wg8VLKlsYMj4U8bpP2F981b+8AVbmsV+5+XtaOnaRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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