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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a50a3f2e5c494df8ccedcffe4645bc0e271ea3d0ae545ca27830fcfeefc59b' 
  AND token = 'SC7lpk+VPzP+BFB++DXdLEY8UsKdAGiO321GypVZNL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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