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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0baa7f0566c682579ab61bba2135b1a5c35f474a26d7ce84b8eca3df40e4b77' 
  AND token = 'L+it268krXgDi5OtuU0jBdz2k4Xa8vijPfEBDZmo1S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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