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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b83d02cb29b62f00369d52a06e6c4e0ee57a62262f7d6c4b6ad1d5800107ef' 
  AND token = 'qiewpSXsUpfJwJ8PxD9YJemVSlCTo18rJ01ZYUQ1VdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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