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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d3dde26ceb545d4a9ae9cd3648012f23ebc01f317ff47f25d3ae7c3fbafd56' 
  AND token = 'wQu/GGJSbZPL6cz4CzNeiWHCd974DeLBVS/VO7QnDDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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