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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ea81b5f5de708ebb7c6009082881d16cd8a11a9488d2cb12caee6e7917d57be' 
  AND token = 'A9WQW09yjw3EBMxMB+iT7Ks/LSPdxLf5H2jAPuJfq68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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