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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91ee81cfa09756f5f569fc5c55ef6a94db28731944c2c8c0126b0310625df29' 
  AND token = 'BUKFD60drWTPdNCQtkuQ0M3jPWU7Rw6aOJbneUxeMRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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