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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '673f68e3d63cf39df66e50002e725fff30528415c573e0e1ed5d3ca931363d99' 
  AND token = '1vfrV/knBAirJA6kb78P7Kyl+ycSAlstmNqIVzceSws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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