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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5d7a2f240fabcd55b6eb328e2ca436b571944a09f942e63c645914724773927' 
  AND token = 'UwbP+HuXxoOMPQ8XEbFn2PtRCzyApl5/ICyeneQXI1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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