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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baec579b8af6dd09a7f315692d72bf4060f8389affd12156dc5dcbe0ab9fc6e3' 
  AND token = '443eSeUnYQU8fVx0byJFnV0N91pLAQdjGmcT6fDKGZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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