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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37be8a710d737afff4d46997d344a6de6dfe9b8c6315ad111e09222aa8b3098' 
  AND token = 'LrjG21H0u5VTrRU9PUklSQkknna2OilxbLWb08hS4q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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