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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813f0268c86930609e4edb6a47697537e12858c891e12f8674ef6a3d0cc16b8f' 
  AND token = 'T8Y6EOnXlIsA3SibEc5/Gb3TkUxsN5n7+/l62gAnkx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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