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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101189e612ba14148c09bcab400ebe0bdf8bfadf33c5bb62d6b8ee114adfce3a' 
  AND token = 'J44K6dg26+Q1ZqD3Y19yP/+y/RWGx5Qs/JHGBXa6Rzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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