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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb54163dd3474e445bb27fc4627f8f4464e0f4ba5321f01cdc9b6ee876956e4' 
  AND token = 'l8NTAWTpWbdMIEEaM35OU3kVuumeU6gaaSx/8F1mKiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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