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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccea1a83f821f240be2d685bdd04424a77da847fb39b8ea9917e1728ac1a584' 
  AND token = 'dDproPlXt+jm6BOFA9ipu4/RvAFJNoUlel6oXmJn21o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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