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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c88433900159edafa18a4628303749afea1a0662968d4168d16a4d35dced1e' 
  AND token = 'tMS0TZCqLr4IAzp8O7iFJie4MRu+5PYrp+LYV2NVyTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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