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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85680997e03ce370ba6771ccb9c111de1e73374793a24d42aac1cf73b0ebc928' 
  AND token = 'mNkSrqyeQ92h50/T43dvEiyv0uQ2ME6CMnt3HsCN/OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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