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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea5c30cb032c0fa5ce5e57a9f4977058ab6f5e0496fe5ecade0f1d2b000165c' 
  AND token = '5RC7CP8Xeo0hsGDTcSAl8L+uRHOikpR3m0qJAKHENxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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