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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102361de3506d15f59aa44d52259bf89f14a37964016429da242774f6d186aaa' 
  AND token = '4zxM1y6ZF1UFugZGGXA/z4GZ41WqMcyCyylcr02OxeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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