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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf15ed87c33efa639f0a2efaf4c00ed739f5b95306c3f1c922e2033a244b4010' 
  AND token = 'KKgid5QyQtQJ480inFCSMhjyfuvpw4ulwx+lj+M4Pcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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