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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fad51f988ca88f4446d09c65d7207401b1345cc09aecef86e22530b156819bd6' 
  AND token = 'rvba0jI4ibjbDKzyPVw9YIDPVPDOdzPugqrCU0QjwOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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