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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367e5b7f0c49ca0a95b1ae70eb9d0ad809a0b0e4bcce424bbee9a9f27825b890' 
  AND token = 'ekDbUFboVOF/5rtlMwhRNYSXnqnLl3Zg79b8/kSoDTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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