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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46e15679615822f3e33e648057b9a59c4f602b05115e1d49adeddb5a1f9e142' 
  AND token = 'ZxJaxlyRGB/1so1axt8rSLe/Pou3pD6T74BuNV11WlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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