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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f7d576fc0c9b36872c83017faf93a7d50a148582d6be94b2835a498ed59ac0' 
  AND token = 'EftmtXM+Asr7uPEf6jeZqJNKRaoqTj60Gz81pf6yfMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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