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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7562c921127f470016efc0258651407f8eb4830f2f9848e77bc2852826b4b28' 
  AND token = 'abYig16Y4+DT2sawZgRVjtrmM2LAm6NcLHML9qa9YOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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