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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a51a47c965d61d4759b4ef2bf7a529590484d499a97708647b95cb0a0af96e6' 
  AND token = 'YMq6I0K36HkrXo1XMEjzW1zPwjmHgwrOAdupGfAZomk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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