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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c43a65de1ea92665c904696e173a34f3c06e5f16df1b85680252527538ceec' 
  AND token = 'hV3FhCqpE3djhAvR1J4uESvnWFGGm0ETeWiz4qQMxPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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