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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0722d8d47ed6144a0be3e819684db6504e6f61cc68e0e0f78dc7c1a091c170' 
  AND token = '6A7Ok7XX1Srd/0x9N/mBtNraFhEBHk5IE/CQiV78U+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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