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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961f7f398cb6455e15cace92bc47128e4f760964a51223a344a28cee240043b6' 
  AND token = 'iwEZyVDsKPkHHfKpPB85McMehKCL4At9i1i169xRHZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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