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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ac16210b53d10345230773955f0f33b12dab8f5d9e1df11fea1ad7bf65a0fc' 
  AND token = 'YbHVIyKjdICN2vg3ZhyHz2EUMknZ3S0Tsp/wP02Fr+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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