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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a184431a40dc6af46a2ee3525076bfa0fe946d5c6db8bce99390e3139bfcbafe' 
  AND token = 'spkOZ6IlPLT/zg7OxlUidfL59oq42HvvrY6qHRZGuvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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