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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c8e4ad193acb28dd99e2022fb494b0e1edcdf1c1b4bb8002179e8f55a57250c' 
  AND token = 'LE+O+GbixxUc5qtubZ0l3fIFKSA4j96lTHXkTTgza74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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