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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9607954a16014d7cc4dfde3b2c17796087c4184d867c0b0d1c4e47008c956e29' 
  AND token = 'Px03NitFzz9bbSF9nNxA7Y1jW8I0xmeG2ayQyJ1cX7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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