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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba0818d32e33a90a22f16a3e4f41ccb7ffafd1ca44bb3ea4c4652749cd2515e' 
  AND token = 'H1a2J2GMdzA2qa42J0azKvDsPPmbLsytqYCYM3pvvHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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