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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5113a9f4f7712554f51e673d7ec13214984a1a43570c4499cc05551068a0b9' 
  AND token = '3NsKXLRJJ3hie3sGSpiIfxVmS6nrRmtXMAtrXe8Kyqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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