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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ceed42ef948ea255748220b2ced2f5640912bdce26f671ea6cfd17fbf8e69e4' 
  AND token = 'WO/yOH+5Y8RXJOzSEqc4YQOAOVsEnJX2qdpfIMulxkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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