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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc6d0ed3132c45447c63fd47d37dbe24bdbc1c071c88f7330dc6892a995ab3d' 
  AND token = '2W9PTcQ7lX+IKsEEIcJKD67MBE59Qhovt9vEVX+Omk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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