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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f006c70921e549838a76b849e4204408cb829c2af52bdbb3f4fd76d3d041a10f' 
  AND token = 'm4TR9HIRj0Y32VjAv3a+Ag1LUjbhkPjpcCqIgrVSoMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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