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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d70e51e19b101a3f037aac6efb5675a6142650ad9bd7590fa140d2696e35721' 
  AND token = '9cEqeCrPztMhIF2F9o6JDrygk4mOtbcTvqboJCgbah0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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