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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3414b5ddb259720fb5b1b36925aac8c1c6c20a3600d278ada776c3b97597f16a' 
  AND token = 'P0RTccEYDRZNe9WsSszQYFBg47AFXXSvabn5hLulUmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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