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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7cfb2602c710977056f321bea57974ce55bd636fa0f6dae795f10755642a2d' 
  AND token = '7LeEZM6C2BAdsbgY+nydsAA19MWXLoeF9czx0wVOqXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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