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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c34f035b247f45c4a66f62f07ffa9404aae79060ff53a6f3b8b755113c6261b' 
  AND token = '9hItrLDoFBjIiHa9Vbgz9zFg0uCpplmX1c74zPHyxho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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