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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c6c72328c73bc59978e4348075312b565bfc63e8c1f07e59aad20a2a6e0ce6' 
  AND token = '75lB6TFhSh6ch0GLS9KtLINuOR3GvhLAD7A/Q66XMUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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