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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e8804c9e5a0b360aab7aceb5c36a4a735567208a039c11ae81e824188a9691' 
  AND token = '6GnHxXT7cPP4f1xdn93zSi9jH4F2cQsUhgjWWRyL0h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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