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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb4f0e31a4ebb0ed49fb64e0534c6cfe7f21a376e0c85bb3903c597f99b0f20' 
  AND token = 'GUNnyNBIcnnwzaI7H0TQXv+UyKdKUo2ff3c/VHm3meE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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