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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a2132523ea6b698179d90fc0c8f976b1213190897572bbe896511c3ca3593d' 
  AND token = 'hWl7xeyyu4PeKnI1o7+Y8JsrgZXCepryTxwMxgnlr7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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