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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c2f1da313cf6ac049b414d403d69d7690150610533f63ed8cb3e3c5f6a159d' 
  AND token = 'n3448l9jbPWdWSn64WI7rfJRh9BFXsLPdinqwjJsE4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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