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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d56908b8aad173a63e76fa2243ced2048e6f89ce0eff113ae0ebf9944356d6' 
  AND token = 'ch0X3ubq5k5KAmHhm89swSsXMaqVNJXNCzd3bd93gIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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