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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50d905eff107fb2d57735bfc41e4b05f3f11658552319008473c116024ba857' 
  AND token = 'T9C6jhdeXqJW5Xc3gkM1fm6Q21XeEnhcuwDfVNfgxTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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