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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e26d5f37799d8816f5f3025e97d313458ba742d1300907e6d0cbc2e20f932d95' 
  AND token = '49DNjkRkZsGl0TaqMzuy0kNCDWb3Z0P/c7k8SNDZMV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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