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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ceed760705c4cc19c737d0473d2d363ff9f283f0329f92bea6e71f6a71319c5' 
  AND token = 'htvKsKH7+ZBX0u9qP77dqI4EmXCCD3Of+5eqXaUn57k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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