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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd216f89dad05747b153862c2a1d60b2513581ff95f80cb72e3fd7996a6e029' 
  AND token = 'rCTDRc/bevi/AZFLK8wn9srF0yd/70wqRUTAknK5dCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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