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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7c15124d27942e5b8d0fa33809a4ae883cd4f84d9500d048ba592da2dee15b' 
  AND token = 'XKIOrN1FeQFjRLk7L0qIaYylHH95X84wj0dq3gxNp8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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