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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc524cfa3fedfa1d237c5a296b4961b0bd04ef8df46707a95f66d6279eccf98' 
  AND token = '8SGOqW4NSUSDGuOcOC+2PcXDxvxPRs5bxVsCZia+Ya4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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