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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88279f369d699cc7a1a3a136bede98be168203451583aea765cee4bbb0ca830f' 
  AND token = 'hDHr62TJ5r7IY64HoMeLxnIz6KwwOaMIHTuzf8DBL/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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