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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4222d36c98111d0d6514ffc240e299fc3ec693ce9bf6c6da7d32067358e0a919' 
  AND token = 'nbPWBxJrWQEg3CFbIxFz92djwAkUk3rTxK1Ax52yRV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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