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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecacd9976fb8b7021c1ae3fbe4238d68b9a77cab20530b88c108eb590fedec4' 
  AND token = 'rvDWzPoSLI43mA6p2MzjB5ZdiNFLFfvOyMQpnBlsAls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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