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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b2c4913bd94e2e6317e86112cebca4ad31797690eb79121c8723d98748d6c7' 
  AND token = 'Qeyny4mfu4MaPLka8zGDWmaBpY1WkNuB7Pid36jW4Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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