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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28338dd17b4f4c7f9e145deedd575488630bc866b9c2798bb146976f89e8e73' 
  AND token = 'aLRmTTY0kK8lL12TD+WPresT1KnSR6YrnnAqjkNSqAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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